Lactose tolerance is the ability to digest lactose, the sugar found in milk and dairy products.


Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

LCT: TT

76%

LCT: CT

16%

LCT: CC

8%

More about LCT

The ability to tolerate lactose is strongly influenced by the body's production of the enzyme lactase, which is encoded by the LCT gene.

To a lesser extent, your gut microbiome influences whether or not you can digest lactose.

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